Enable compiler temporaries

Compiler temporaries are a facility for having virtual register sized space
for dealing with intermediate values during MIR transformations. They receive
explicit space in managed frames so they can have a home location in case they
need to be spilled. The facility also supports "special" temporaries which
have specific semantic purpose and their location in frame must be tracked.

The compiler temporaries are treated in the same way as virtual registers
so that the MIR level transformations do not need to have special logic. However,
generated code needs to know stack layout so that it can distinguish between
home locations.

MIRGraph has received an interface for dealing with compiler temporaries. This
interface allows allocation of wide and non-wide virtual register temporaries.

The information about how temporaries are kept on stack has been moved to
stack.h. This is was necessary because stack layout is dependent on where the
temporaries are placed.

Change-Id: Iba5cf095b32feb00d3f648db112a00209c8e5f55
Signed-off-by: Razvan A Lupusoru <razvan.a.lupusoru@intel.com>

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